david winter
Classical music lover.
Hi,
I'm just finishing a Marantz 1060 (I have done several so far without trouble).
In short, it's recaped with audio grade caps, the 2SC458 are replaced by KSC1845 as usual, etc.
My problem is that the lower part of the sine wave still shows a slipping whatever the adjustments.
Note that both bias set very nicely.
I replaced both 2SD438 (H703 / H704) which had a gain of about 55 (specs say 75min) and very oxidized legs. 2SC960 are shown in my service manual (I guess at least two referneces were used). Both original 2SD438 were replaced by NOS 2SD438 that I had in stock and which worked without trouble on a 1070. However, they have a gain of 120 to 160.
All other transistors on the output board are originals.
Is the problem due to the gain of those 2SD438 ? If so, is there a mod to accomodate this or should I simply use another type ? I'm asking because right now I don't have any 2N3440 (as suggested in other threads) but wonder if any other classic type could replace them.
Thanks !
I'm just finishing a Marantz 1060 (I have done several so far without trouble).
In short, it's recaped with audio grade caps, the 2SC458 are replaced by KSC1845 as usual, etc.
My problem is that the lower part of the sine wave still shows a slipping whatever the adjustments.
Note that both bias set very nicely.
I replaced both 2SD438 (H703 / H704) which had a gain of about 55 (specs say 75min) and very oxidized legs. 2SC960 are shown in my service manual (I guess at least two referneces were used). Both original 2SD438 were replaced by NOS 2SD438 that I had in stock and which worked without trouble on a 1070. However, they have a gain of 120 to 160.
All other transistors on the output board are originals.
Is the problem due to the gain of those 2SD438 ? If so, is there a mod to accomodate this or should I simply use another type ? I'm asking because right now I don't have any 2N3440 (as suggested in other threads) but wonder if any other classic type could replace them.
Thanks !